Replaced all the flooring, Doubled the size of the master bathroom and relocated the master closet.

If the doorknob needs to be replaced or the home needs some touch-up paint, you may be able to handle it.

I could get a cheap replacement doublewide for maybe $85-$90k.

If I had replaced it, I would have spent 30 minutes getting it out and putting in the new one, the dump fees, and the cost of the new fridge. 

Our property manager had a handy man install the new fridge.Fast forward to today, I get a call from the Property Manager saying that the new tenant reported water leaking behind the fridge, after a deeper look baseboards are curling up, mold is under the baseboards, and they need to remediate mold and likely replace the floors!

My goal, like many others, is to invest in multiple buy and hold multifamily properties (probably spread across southern Maine) until I can replace my W-2 income.

That'd give me (3,954) in mortgage payments for cash flow of 8,836 - 736 monthly or 184 per unit.Feels good from a high level, but this old of a home I expect extreme capex costs in the next handful of years (no replacements to roof or furnace). 

Should I cash out this amount and replace it with $10k from the LOC or keep the "clean" cash in there?

They fumigated, ripped up & replaced flooring, repainted walls, ceilings trim and doors and replaced doors, Got the bad tenants out and much more.

Replaced the electrical panel and most of the wiring, all switches and outlets.